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Definition of caustic. 1 : capable of destroying or eating away by chemical action : corrosive The chemical was so caustic that it ate through the pipe. 2 : marked by incisive sarcasm a caustic film review caustic humor.
Princeton's WordNet(0.00 / 0 votes)Rate this definition: 1  caustic(adj) any chemical substance that burns or destroys living tissue. 2  acerb, acerbic, acid, acrid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic(adj) harsh or corrosive in tone.